nullableRef

Just like Nullable!T, except that the object refers to a value sitting elsewhere in memory. This makes assignments overwrite the initially assigned value. Internally NullableRef!T only stores a pointer to T (i.e., Nullable!T.sizeof == (T*).sizeof).

struct NullableRef(T)
auto nullableRef(T* t)
auto
nullableRef
(
T
)
(
T* t
)

Examples

1 import std.exception : assertThrown;
2 
3 int x = 5, y = 7;
4 auto a = nullableRef(&x);
5 assert(!a.isNull);
6 assert(a == 5);
7 assert(x == 5);
8 a = 42;
9 assert(x == 42);
10 assert(!a.isNull);
11 assert(a == 42);
12 a.nullify();
13 assert(x == 42);
14 assert(a.isNull);
15 assertThrown!Throwable(a.get);
16 assertThrown!Throwable(a = 71);
17 a.bind(&y);
18 assert(a == 7);
19 y = 135;
20 assert(a == 135);

nullableRef

Examples

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